If you want to see your tasks by Due Date, click on the "Schedule" option at the top of the plan.
This will open a calendar view of all your tasks. You can add new tasks, drag tasks to different days to provide new due dates or move calendar tasks to remove the due date altogether.
The calendar shows the current month by default, but you can click the "Week" button to show a week view.
Agenda view is the best way in Microsoft Planner to get an overview of everything you need to do. It's much easier to understand your workload when you can visualize it.
Whether you view by week or month, you can drag and drop any task to a new date to change the due date.
You can also drag any task from the "Unscheduled Tasks" list onto the calendar to give it a due date.
On the other hand, you can also drag a task from the calendar to the "Unscheduled Tasks" list to remove its due date.
Add new tasks by clicking the "Add Task" button or the plus sign (+) on any date, automatically setting the task's due date to that date.
The Agenda view will give you a different perspective on your tasks, as well as give you an intuitive idea of how much work is coming up.